Wire wound armature



V. G. APPLE Aug. 8, 1933.

OUND ARMATURE Filed Feb. 5, 1950 UNITED STATES PATENT OFFICE WIRE womynARMATYURE Vincent G. Apple, Dayton, Ohio; Herbert F.

Apple, Edward M. Apple, and Gourley. Darroch' executors of said VincentG. Apple, deceased Application February 3, 1930. Serial No. 425,687

6'Claims. (01. 171-206) This invention relates to armatures of the classcomprising a magnetizable core, a commutator and a wire winding havingleads connected to the bars of the commutator.

The object of this invention is togenerally improve an armature of thisclass.

More specifically the objects are to provide an armature wherein thewinding is embedded in and surrounded by a mass of hard moldedinsulation which also extends over and around apart of the commutator,through the interstices of the winding to the shaft, so cementing theseveral parts together as to effectively prevent relative movement ofthe core and commutator or of the turns of the wire one with another,-to the end that destruction of the armature due to breakage of the finewires is eliminated, deterioration due to the absorption of oil,moisture and.

other foreign matter by the winding is prevented, a better runningbalance will be had, less air resistance to rotation of the armaturewill be encountered, and better driving relation between the driving anddriven elements will be established.

I attain these objects by the structure illustrated in the drawingwhereinv Fig. 1 is an axial section through a mold in which-my armatureis completed.

Fig. 2 is a transverse section taken at 2-2 of Fig. 1.

Fig. 3 shows the completed armature on a reduced scale,

Similar numerals refer to similar parts throughout the several views.

To produce an armature according to my invention I assemble the core 10on the shaft :11

then put on the wire winding, the back head 12 and the front head 13extending beyond the core in the usual manner- The commutator compris-'ing a plurality of segments 14 imbedded in a hub 16 of insulation isthen pressed lightly on to the shaft, the press fit being suflicientonly to temporarily hold the commutator placed until the wire windingleads are connected to the commutator bars, after which further meansare applied to permanently hold the commutator in place. The commutatorhas a groove 17 encircling it 'at its outer diameter dividing its lengthinto two parts, the part 18 being used for the brush track and the part19 having a longitudinal groove in the top of each segment into whichthe wire leads are placed and soldered or otherwise electricallyconnected' After all connections are made the armature is placed in themold Fig. 1 which comprises the base 21 having an opening 22 to receiveshaft 11, a larger opening 23 to receive part 18 of the commutator and astill larger opening 24 to receive the downwardly extending neck 26 ofthe mold body 27.

The body 27 has an opening 28 of the diameter of the core 10 all the waythrough. At the lower end of opening 28 is a collar 29 which surroundsand fits the front winding head 13 closely, having also an annular rib31 extending into the groove 17 of the commutator. The, upper edge 32 ofthe collar rests against the core 10 so that there is no tendency forthe core to be pushed toward the commutator when downward pressure issubsequently applied to the core; 'The collar is divided into threeparts separated by radial planes 33.

In the upper end of the opening 28 of body 27 is the plunger 34 havingthe central opening 36 to admit the shaft 11 andthe cupped out portion37 at the lower end to fit over the back head 12 snugly.

In placing the armature in mutator part 18 is first put into the'openingthe opening 22. The three parts of collar 29 are then putaround the head13 with the rib 31 in the groove 1'7. The body 27 is then broughtdownward with its opening 28 over the core 10 and over the three partcollar 29. The insulation is then put in the upper end of theopem'ng 28,the plunger 34 entered and forced downward to the position shownforcingthe insulation the mold the com- 23 of the base 21, the shaft 11extending through shaft 11 to make contact therewith and adhere thereto,so that after the fluid is solidified by such process as the nature ofthe insulation requires there will be a solid mass of insulation whichcements the shaft, the core, the commutator and the windings together,providing driving relation between the shaft and the driven' parts, thewindings being imbedded 'in and surrounded by the insulation, thatportion surrounding the front head 13 extending also over the hub 16.02the commutator to surround it so as to effectively prevent rotative oraxial movement of the commutator relative to the core, either movementbeing destructive to the armature because the connections of the wiresto the segments are usually broken -thereby. w

Fig. 3 shows the completed armature after 'removal from the mold, and,considered in connection with the foregoing description, it will beapparent that a better running balance is obtained, less air resistanceto rotation is encountered, protection against absorption by thewindings of oil, moisture and other foreign matter is assured, relativepositioning of the several parts is-more firmly secured, and betterdriving relation between the driving and driven parts is established.

Holding this view of the scope of the invention, I claim 1. In anarmature, a magnetizable core, a winding of insulated wire on said core,a commutator comprising a plurality of metal segments insulatedly spacedapart in a hub in axial alignment with said core and having its segmentsattached to flexible leads emanating from said Winding, and a separateconcentric collar of hardened insulating cement extending from the coreto the hub of the commutator cementing them together thereby maintainingtheir spaced apart relation, said winding being imbedded in andsurrounded by said collar.

2. In an armature, a magnetizable core, a winding of insulated wire onsaid core, a commutator comprising a plurality of metal segmentsinsulatedlyispaced apart in a hub in axial alignment with said core andhavingits segments attached to flexible leads emanating from saidwinding, and a separate oncentric collar of hardened insulating cementi-extending from the core to the commutator and overlapping the innerend of the commutator cementing them together thereby maintaining theirspaced apart relation, said winding being imbedded and completelyenclosed in said-collar.

3. An armature comprising a magnetizable core, a commutator in axialalignment with said core, said commutator being composed of a pluralityof segments of conductive material imbedded in a hub of moldedinsulation, a winding on said magnetizable core composed of a pluralityof turns of wire having flexible leads at intervals joined to bars ofsaid commutator, and a separate concentrically molded collar ofinsulating cement extending from the core to the commutator andoverlapping the insulation hub of said commutator cementing the core andcommutator together thereby maintainingtheir spaced apart relation, saidwinding ,being imbedded and completely contained in said collar.

4. An armature comprising a shaft, a magnetizable core on said shaft, acommutator comprising a plurality of metal segments ,insulatedly spacedapart in a hub on said sha'ft said hub being axially spaced apart fromsaid core, a winding on said core extending beyond the end thereof andsurrounding said shaft, flexible lead wires emanating from said windingand connected to said commutator, and a smooth, round, concentric collarof molded insulating cement extending from the core to the commutatorhub and through the winding to the shaft completely enclosing thewinding and cementing the commutator and winding to the shaft tomaintain driving relation therebetween.

5. A method of assembling and permanently uniting a wire wound armaturecore, an armaturc shaft, and a commutator, which consists of placing thecore on the shaft, placing the winding on the core, lightly pressing thecommutator on the shaft, connecting the winding to the commutator,placing the assembled structure in a mold, holding the commutator andcore from moving toward or away from each other by a portion of themold, pressing a mobile insulating cement around the shaft, through andaround the winding and the connections, between thewinding and thecommutator and around the end of the commutator hardening the cement,then removing the structure from the mold.

6. Steps in the method of making an armature which consists of winding aplurality of turns of insulated wire into the slots of a core leavingcircumferentially spaced apart wire leads extending, molding a core ofinsulation into a plurality

